Filtering material.



AJE. KRAUSE. PILTERING MATERIAL. APPLICATION FILED' Nov. 27, 1912.

1,056,800. Patentd Mar. 25, 1913.

o Umzugs: Syvum/Lilo@ use in the process ARTHUR E. xRAUsE, or JERSEY CITY, NEW JERSEY.

FILTERING MATERIAL.

Specification of Letters Patent.

Patented Mar. 25, 1913.

Application filed November 27, 191'2. Serial No. 733,729.

My invention relates to an improved fil-\ tering material, particularly adapted for of separating oil and grease from water, described in U. Si Letters Patent Nos. 705,253 and 729,775; but- -my improved filtering mat'erial is also applicable tol filt-ration of other liquids than water carrying oil o-r grease.

The improved 'filtering material herein described comprises a mechanical mixture of fibrous mineral material and combustible granular material.

Heretofore a filtering material composed of fibrous material and non-combustible granular material has been proposed; the primary function'-of the granular material in suchfiltering material being to avoid undue compression of the fibrous material, and the consequent early clogging of the filtering material. Owing to the compressible nature of fibrous material when used in bulk in an ordinary filter, the usefulness of the material is soo-n limited by reason of the entire bulk thereof becoming so tightly packed or compressed that the amount of liquid which can be forced through or made to pass in a given time, soon becomes' too so that the process `must vsoon be interrupted in vorde-r tostir'up and loosen the material so as to permit the liquid to flow through with more freedom. If a hard or relatively incompressible. granular material be mixed in suitable proportions with the fibrous material, the entire bulk of' the fibrous filtering material retains its form, and cannotbe compressed' as it would be if the fibrous material alone were used, the reason being, presumably, that all the compressive force exerted by reason of the pressure at which the fluid to be filtered -is supplied, istaken up'by the grains of incompressible material, thus'protecting the fibrous material within the interstices of the incompressible material from detriment-al pressure tending 'to pack the fibers together, the result being that the. flow of liquid between the particles of fibrous material is made very much l reducing to a easier, the filter can be operated a much longer time before it becomes so clogged as to require cleaning, and the contact of the liquid with the fibrous material is rendered all the greater| a'nd more efficient.. In former mixtures of fibrous filtering material and vgranular material, the granular ma'- terial has been of an incombustible nature. Such filtering material, when finallyclogged or, as is said in the art, exhausted, cannot be utilized or disposed of to advantage, but must be carried away at considerable expense; and if clogged with oil or grease of a deeomposable nature, or with other objectionable materials, may become aconsiderable nuisance.

According to myV present invention the rial employed is a combustible material, such as charcoal, coke, coal screenings, sawdust, etc. A lfiltering material comprising a mixture of such granular combustible material andfibrous material, when exhausted, may be charged into a furnace (for example', the furnace of a steam boiler) and there burned. Particularly if the filtering material has been used for filtering oil or grease out of water, or other liquid, the exhausted filtering material, whe'nlso charged into a furnace, burns freely. Of course the incombustible constituents, if any, of such filtering material, do not burn; but the combustible constituents do burn, as well as the combustible material (oil, grease, etc.) with which the filtering material may be charged.

The object of my invention is to produce a filtering material that may be utilized economically as a useful waste product after the said material has become exhausted, thus minimum the cost of disposal of the exhausted filtering material, and even rendering it valuable as a fuel.

I will now proceed to describe my invention with reference to the accompanying drawing, in which a filter containing a body of filtering material .such as hereinbefore referred tois illustrated more or less diagrammatically.

In the said drawing: Figure l shows a cent-ral vertical section of the filter andFig, 2 is a diagrammatic View illustrating on an enlarged scale the mixture of combustible granular material and fibrous material 'emloyed as a filtering material.

'In the said drawings, 1 designates a container for the filtering material, having a i granular substantially incompressiblematescreen false bottom 2, and having an entrance connection 3 and a discharge connection 4.

5 designates the filtering material, the

vsame Comprising a mechanical mixture of the fibrous, elastic or compressible absorb- Aent filtering material 6 is, preferably, asbestos, fibrous serpentine, kor the comminuted serpentine rock from which the asbestos is mined. The combustible granular incom pressible material is preferably charcoal, coke, coal screenings, or sawdust, though other granular combustible materials may be employed. The filtering mixture (supposing the fibrous material to be fibrous serpentine andthe combustible material to be coke) may contain said ingredients in the proportion of one part by weight of' fibrousserpentineto two parts of combustible material; the coke being preferably of such size as will pass through; screens lof from ten to sixty meshes to the inch; although I do not limit 'myself to any part-icu-v lar size of granular combustible material. The proportlons of the two ingredients may .also be varied widely without departing*l from my invention.

The mixture of asbestic or serpentine material and granular combustible material,

-besides being useful for the extraction of .grease from steam or air.

oil and grease,

oil or grease, is also applicable for the separation of various other substances. The improved filtering material herein described may also be used for the extraction of oil or I do not'limit myself to the use of my filtering material for filtering any particular substance, orto the use of any particular form of filtering apparatus, or .to any particular method of disposing of the ltering material when exhausted. l

Coke or charcoal', when added to asbestic or serpentine filtering material, has the advantage, for .the separation of oil, grease, andsome other substances, that the coke or charcoal, being porous, is itself absorbent of oil, grease', and some other substances, to a considerable extent; so that in such cases the coke orcharcoal has in itself an effective filtering action and acts as a filtering material in addition to acting 'to prevent undue compression of the fibrous material.

What I claim is 1. A filtering material comprising a mechanical mixture of combustible granular material and fibrous mineral material.

' 2. A filtering material consisting of approximately two parts of comminuted coke, and one parbof asbestic fiber.

In testimony whereof I'have signed this specification in the presence of two subscribing witnesses.

. ARTHUR E. KRAUSE. IVitnesses:

' H. M. MARBLE,

l D. A. DAvrEs. 

